Name Class Date. Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence.
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1 Skills Worksheet Directed Reading B Section: The Nervous System TWO SYSTEMS WITHIN A SYSTEM 1. What does the nervous system do? a. pump blood b. gather and interpret information c. digest food d. eliminate waste Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. central information nerves peripheral central command post 2. The nervous system is the body s. 3. The nervous system gathers and interprets. 4. Your brain and spinal cord are the nervous system. 5. The nervous system does NOT include the brain and spinal cord. 6. The peripheral nervous system uses specialized structures called to carry information. Holt Science and Technology 9 Communication and Control
2 THE PERIPHERAL NERVOUS SYSTEM 7. What are special cells in your body that transfer messages called? a. impulses c. neurons b. homeostasis d. cell bodies 8. What are fast-moving electrical messages that travel along nerve cells called? a. impulses b. dendrites c. axons d. cell bodies Neuron Structure Read the description. Then, draw a line from the dot next to each description to the matching word. 9. allows the neuron to receive information 10. carry impulses from the cell body 11. has a nucleus and cell organelles a. cell body b. dendrite c. axon Information Collection 12. Which neurons gather information about what is happening in your body? a. motor neurons b. sensory neurons c. receptors d. light Holt Science and Technology 10 Communication and Control
3 13. What are the specialized nerve endings at the end of the sensory neurons? a. motor neurons b. sensory neurons c. receptors d. light Delivering Orders 14. What neurons send impulses from the brain and spinal cord? a. motor neurons b. sensory neurons c. receptors d. light NERVES 15. What connects the central nervous system to the rest of the body? a. axons b. nerves c. blood vessels d. connective tissue 16. Where are all of the nerves in your body? a. in your head b. in your spine c. in your muscles d. everywhere in your body 17. Which of the following are a part of nerves? a. skeletal muscles c. axons b. skin cells d. bones Holt Science and Technology 11 Communication and Control
4 SOMATIC AND AUTONOMIC NERVOUS SYSTEMS Somatic Nervous System Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. voluntary autonomic somatic homeostasis 18. Most of the nervous system is under your conscious control. 19. The somatic nervous system controls movements, such as smiling. 20. Digestion and heart rate are functions controlled by the nervous system. 21. The sympathetic and parasympathetic nervous systems work together for. THE CENTRAL NERVOUS SYSTEM The Control Center voluntary involuntary brain 22. The main control center of the central nervous system is the. 23. Things the brain controls that happen without thinking are called. 24. When you move your arm, the action is. Holt Science and Technology 12 Communication and Control
5 The Cerebrum Circle the letter of the best answer for the question. 25. What is the largest part of your brain? a. right hemisphere b. left hemisphere c. cerebrum d. medulla Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. hemisphere cerebrum 26. You think and store memories in the. 27. Your right hand is controlled by the left of the cerebrum. The Cerebellum 28. What part of your brain helps you keep your balance? a. cerebrum b. hemisphere c. cerebellum d. medulla Holt Science and Technology 13 Communication and Control
6 The Medulla 29. What is one involuntary process the medulla controls? a. balance b. talking c. memory d. heart rate THE SPINAL CORD 30. What are the bones that protect your spinal cord called? a. neurons b. homeostasis c. vertices d. vertebrae Spinal Cord Injury 31. Which of the following could be affected by a spinal cord injury? a. sense of smell b. sight c. sense of touch d. hearing Holt Science and Technology 14 Communication and Control
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